KVM / Virt-Manager Setup on LainOS Layer 02

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1. Install KVM packages

doas pacman -S qemu-full virt-manager virt-viewer dnsmasq bridge-utils openbsd-netcat dmidecode ebtables iptables libguestfs

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2. Create the libvirt-qemu user and group

doas groupadd libvirt-qemu
doas useradd -r -d /var/lib/libvirt/qemu -s /sbin/nologin libvirt-qemu

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3. Create the libvirt group and add your user

doas groupadd libvirt
doas usermod -a -G libvirt lain
newgrp libvirt

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4. Create the libvirtd OpenRC init script

doas nano /etc/init.d/libvirtd

Paste this content:

#!/sbin/openrc-run

description="Libvirt virtualization daemon"
command="/usr/bin/libvirtd"
command_args="--daemon"
pidfile="/run/libvirtd.pid"
command_background="yes"

depend() {
    need net
    after dbus
}

Save and exit, then make it executable:

doas chmod 755 /etc/init.d/libvirtd

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5. Configure libvirt for non-root user access

doas nano /etc/libvirt/libvirtd.conf

Find and uncomment these two lines:

unix_sock_group = "libvirt"
unix_sock_rw_perms = "0770"

Save and exit.

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6. Enable and start libvirtd

doas rc-update add libvirtd default
doas rc-service libvirtd start
doas rc-service libvirtd status

Status should show started.

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7. Fix socket path

On LainOS, /var/run is not a symlink to /run. Create the symlink manually:

doas ln -s /run/libvirt /var/run/libvirt

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8. Fix socket permissions

doas chown root:libvirt /run/libvirt/libvirt-sock
doas chmod 0770 /run/libvirt/libvirt-sock

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9. Load the tun module (persistent)

doas mkdir -p /etc/modules-load.d
echo "tun" | doas tee /etc/modules-load.d/tun.conf
doas modprobe tun

The modules service runs at boot and will load tun automatically on every subsequent boot.

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10. Create the virtlogd OpenRC init script

doas nano /etc/init.d/virtlogd

Paste this content:

#!/sbin/openrc-run

description="Libvirt logging daemon"
command="/usr/bin/virtlogd"
command_args="--daemon"
pidfile="/run/virtlogd.pid"
command_background="yes"

depend() {
    need libvirtd
}

Save and exit, then make it executable and enable it:

doas chmod 755 /etc/init.d/virtlogd
doas rc-update add virtlogd default
doas rc-service virtlogd start

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11. Launch virt-manager

virt-manager --connect qemu:///system

virt-manager must be launched from a terminal on LainOS Layer 02.

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Notes

• Always use doas instead of sudo on LainOS Layer 02
• systemctl does not exist — use rc-service and rc-update
• libvirtd and virtlogd will autostart on every boot once added to the default runlevel
• The tun module will autoload on every boot via /etc/modules-load.d/tun.conf